Pytorch tutorials exercices

Hi Robert,

I followed your Pytorch tutorials for NLP and I implemented 2 exercices that you proposed. 
The Cbow and the character level enriching of word embeddings of the POS tagger. 

I would appreciate if you review/comment my implementation and why not discuss about it.  

Here is the repo's link: https://github.com/MokaddemMouna/Pytorch

Thanks. 
